Adding the trailing backslash didn't have any impact in Firefox and the other browsers didn't care.
It is an older version - but not too old - 1.3.11. I did a completely new install of the core, then added the module folders, themes, and uploads. At that point, Firefox would open the site when the URL was localhost. Once I switched to the site's database, Firefox wouldn't load the site when the URL was localhost/xxx. Copies of other sites opened up just fine.
There has to be something in the data stream that comes from the db that Firefox just stops loading the page (all pages on the site - so in the header). Unless the URL is changed to computername.local/xxx for this site only.
There are better things to figure out and I'll just adjust and move on for now.
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